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Part I the Selenium Dehydrogenation Op PART I THE SELENIUM DEHYDROGENATION OP PRIEDELINOL PART II THE BROMINATION OP FRIEDELIN BY . \ WILLARD TV HASKINS \ \ Thesis submitted to the Faculty of the Graduate School of the University of Maryland In partial fulfillment of the requirements for the degree of Doctor of Philosophy* 1936 • UMI Number: DP70114 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. Dissertation Publishing UMI DP70114 Published by ProQuest LLC (2015). Copyright in the Dissertation held by the Author. Microform Edition © ProQuest LLC. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code uest ProQuest LLC. 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106- 1346 ACKNOWLEDGMENT The writer Is Indebted to Dr* N* L# Drake, under whose direction and advice this work was carried out* TABLE OF CONTENTS Page PART I Review or Literature ...••.•» 1 Introduction ... 11 Experimental ...... 15 Conclusions ....... ... 28 Summary ............................... 29 Bibliography ..................... 50 PART XI Introduction * • •.... 51 Experimental...... 55 Conclusions •. * 55 REVIEW OP LITERATURE ON TRITERPENES PROM 1933 TO DATE* Ruzicka, previous to 1933, had proposed a structural formula (I) for the carbon skeleton of the trlterpenes based on dehydrogenation products* Up to 1933 only comparatively few of the dehydro­ genation products had been positively identified and their structures proved correct; namely, 1 ,2 ,3 ,4, tetramethyl benzene, 1,2,7 trimethyl naphthalene (sapotalene) and 2,7 dimethyl naphthalene* Other products had been obtained and tentatively identified but definite proof of their structure was still lacking* The products whose structures were still in doube were thought to be a tetramethyl naphthalene, an hydroxy trlmethyl naphthalene, and a trimethyl plcene* In 1933 Ruzicka* attacked the problem of the tetramethyl naphthalene* The relatively high melting point of this compound led him to the conclusion that # For literature previous to 1933 see H* M* Duvall, Doctor*s Thesis, U. of Md*, 1936. 2 the methyl groups were syme trie ally arranged in the molecule* It had been previously assumed from the proposed formula (I) that this should be 1,2,5,6 tetramethylnaphthalene (V)* J00 2 Z F " F T Y ^ f T This compound was synthesized and found to be identical to the product obtained by dehydrogenation* Since this compound was the expected one it was concluded that this was good supporting evidence for the hydrogenated picene nucleus of the proposed formula* This picene nucleus was originally assumed on the analogy to the structure of tetracyclosqualene and its; behavior toward selenium dehydrogenation, and also that the picene structure was the logical continuation of the phenanthrene ring system in the di-terpenes* 3 The formula V thus can be a confirmation of the formula VI, if it is true that the formation of IV and V is by the opening of I along the dotted line* (This statement must now be modified as will be shown later*) Buzicka suggests here that there are many formulae which may be constructed from isoprene units which would also yield these substituted naphthalenes and hence the structure of the trimethyl picene should be determined*to establish the ring system* During the next year (1934) Ruzicka continued his work on dehydrogenation of various triterpenoids, describing the dehydrogenation of "Betulin11^* This compound was mentioned especially, since along with the usual dehydrogenation products, (I, II, IV, V) was produced an hydrocarbon melting at 324° which analyzed for ^25^20 or same as so-called trimethyl picene previously obtained which had a melting point of 306°♦ None of the material melting at 306° was obtained* Ruzicka concluded from this that the new compound was either an isomer or a homologue of the trimethyl picene, and hence that betulln perhaps had a somewhat different carbon skeleton than the other polycycllc terpenes* It may also be noted that no 2,7 dimethyl naphthalene — 4 was isolated from betulin which, also points to a somewhat different structure* Buzlcka reports In this paper^ that betulin also gives similar products on dehydrogenation with palladium black as on selenium dehydrogenation* In this case the products were solely 1 ,2 ,5 ,4 tetramethyl benzene, sapotalene, and 1 ,2 ,5,6 tetramethyl naphthalene* Palladium dehydrogenation was employed to make a study of the gaseous products* The ratio of hydrogen to methane was found to be 2*5:1 as was the case with the other triterpenes studied* Hederagonln, oleanolic acid, and sumaresinollc acid were also dehydrogenated^* These produce the usual products already noted together with the CggHgC) kydro- carbon melting at 306° • Hederagenln also gave a new product C1 8 H18, which was shown to be a substituted phenanthrene by the formation of a qulnone and a quinoxaline* Oleanolic acid (C3 0 H4 3 O3 ) also produced a saturated hydrocarbon CggHc-Q (m*p* 175°) formed by the elimination of CO2 and H2 0 * As a control on the selenium dehydrogenations a series of palladium dehydrogenations were made* This dehydrogenation allows a study of the gas relations Involved as previously mentioned* Oleanolic acid gave a ratio of methane to hydrogen of 4:10, while from the proposed formula (allowing for introduction of one hydroxyl and one carboxyl) a ratio of 4 : 6 would be expected. The products from palladium and selenium are the same* hence the ratio of methane to hydrogen found can be produced by no other mechanism* A table of substances dehydrogenated and the products produced follows: 6 Dehydrogenation Products of Triterpenes I s II si’ll IV V f VI VII VIIIsix Betulin + Se 4- t Vila Hederagenin 4- Se + 4* 4* { + Hederegenin 4- Pd 4' + + 4” + Oleanolic acid 4- Se 4- 4- 4- 4* 4- Oleanolic acid 4- Pd + + Sumaresinolic acid 4* Se Sumaresinolic acid 4- Pd Siaresinolic acid 4* Se + 4> Oypsogenin 4* Se + 4- I - 1,2,3,4 tetramethyl benzene II - 2,7 dime thy lnaphthalene III - 1,2,7 trlmethyl naphthalene (sapotalene) IV - hydroxy trimethyl naphthalene V - 1,2, 5,6 tetrame thy lnaphthalene VI - phenanthrene hydrocarbon C^q H^q awp# 126° VII - picene hydrocarbon C2 5 H2 0 m*P* 305° Vila - isomeric C2 5 ^ 3 0 nup, 325° VIII - dinaphthyl hydrocarbon C2 5 H2 4 nwp# 143° IX - dinaphthyl ethane (?) hydrocarbon C2 7 H2 8 nwp* 117° 7 - Ruzicka* s next problem was the proof of the structure of the hydroxytrimethyl naphthalene isolated from a number of the trlterpene alcohols and hydroxy acids* He had previously assumed this to be a substituted sapotalene with the hydroxyl in the 6 position* This assumption was based on the fact that all the triterpenes that produced this compound exhibit a secondary hydroxyl, and that the hydroxyl of the naphthol represented the secondary alcohol group of the natural substance* From the degradation of hederagenin, one of the alcohols producing hydroxytrimethyl naphthalene, it had been shown that the carbon adjacent to the one carrying the secondary hydroxyl had two methyl groups attached to it, both carbons being part of a ring system* One of these methyl groups also carries a primary hydroxyl group, while in most of the other triterpenes the methyl groups are free of oxygen* Hence the assumption that the cleavage of ring C (X) would produce a 1,2,7 trimethyl 6 hydroxy naphthalene •(!!) Hd - 8 - It had also been found that zinc dust distillation of the hydroxy trim ethyl naphthalene, or distillation over Ni at 300°, produced sapotalene* However, when the expected 1,2,7 trimethyl-6 -methoxy naphthalene was synthesized It was found to differ from the methoxy derivative of the substance from dehydrogena­ tion* The other four isomeric methoxy sapotalenes were prepared and they too were found not to be the same as the dehydrogenation product* The only conclusion to be drawn is that the substance is not a sapotalene derivative* In a later paper® Ruzicka reports the determination of the structure of this hydroxy trimethyl naphthalene* The methoxy derivative of the dehydrogenation product was catalytically hydrogenated by warming slightly with platinum in glacial acetic acid whereby a trimethyl- decahydronaphthalene was produced with the removal of the methoxyl* Since this method is very mild, no rearrangements would be expected* Dehydrogenatlon of this with palladium black at 300° gave no sapotalene but 1 ,2 , 8 trlmethyl naphthalene. Therefore, the hydroxytrimethyl naphthalene must be 1 ,2 , 8 trimethyl-7-hydroxynaphthalene* Hence In the dehydrogenatlon of triterpenes of this - 9 type a pinacoline rearrangement must occur This lead Ruzicka to propose a new structure for ring A for triterpenes of this type The structure of the CggHgQ m#p* 506 hydrocarbon is still unknown* although it is well established that it is a picene homologue* Ruzicka has shown that its ultra­ violet absorption spectra is very similar to that of coal tar picene^* He has synthesized two methylated picenes* namely* 5*8 dimethyl* and 5*9*10 trimethyl (see numbering system above)* neither of which are identical to the 10 dehydrogenatlon product but whose absorption spectra (especially the latter) are very closely related to 6 that of the dehydrogenatlon product* - 11 - INTRODUCTION Selenium dehydrogenatlon has become an Important method for the investigation of the
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